He's now focusing his attention on coaching and Head of Strength and Conditioning Paddy Anson has wasted no time in bringing Devonish in to work with the Gloucester squad.
"The bottom line is Marlon is an expert in speed, he's done it all his life", Anson explained.
"We've got a very quick back line, we've got potentially a lot of England players in that back line, so we have to give them the best coaching we can. I'm certain Marlon will be the person to do that."
And Devonish feels he can make a real impact upon a squad that already boasts considerable speed.
"Speed is crucial in most sports, if you look across the board in all sports, speed is a crucial factor in rugby, football and cricket to name but three.
"It's a skill and it's a skill that can be learnt. For me, it is great to do this. After years of competing I feel like I can give back and share what I've learnt."
To view video of Paddy and Marlon talking in more detail about the appointment, click HERE.